CN115229305A - Method for improving bending performance of welded joint of pickled plate - Google Patents
Method for improving bending performance of welded joint of pickled plate Download PDFInfo
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- CN115229305A CN115229305A CN202210811168.5A CN202210811168A CN115229305A CN 115229305 A CN115229305 A CN 115229305A CN 202210811168 A CN202210811168 A CN 202210811168A CN 115229305 A CN115229305 A CN 115229305A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
Abstract
The invention provides a method for improving the bending performance of a welding joint of a pickled plate, which comprises the following steps: firstly, selecting a pickling plate, and selecting a welding wire, wherein the welding wire comprises the following chemical components in percentage by mass: 0.6% -0.8% and V: 0.3-0.6%, the diameter of the welding wire is 0.8-1.2 mm, and finally, the acid-pickled plate is welded by adopting gas shielded welding or laser welding. According to the invention, a certain amount of Ni and V elements are added into the welding wire, and the pickled plate is welded by gas shielded welding or laser welding, so that the grain size of the welding seam is refined, the plasticity and toughness are effectively improved, the bending performance of the welding joint is further improved, and the problem of welding seam cracking is effectively solved.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a method for improving the bending performance of a welded joint of a pickled plate.
Background
The process of converting the materials into the products is not separated from processing, the processing process is a value-added process, and the value-added process is also the basis for the survival and the profit of each enterprise. How to ensure that the high efficiency and the low cost are realized in the processing process and the market demand can be met in time is a permanent topic. If any new material can not realize high-quality connection, the application of the new material is also limited greatly, and the new material cannot be widely applied. In the manufacturing process of an automobile body, each automobile manufacturing enterprise can not weld, the quality of a welding joint directly determines the stability and safety performance of an automobile, particularly in a structural part, the welding joint is required to have high strength and certain plasticity, particularly in the subsequent forming and processing process, the requirement on the bending performance of a welding seam is high, and the improvement on the bending performance of the welding joint is a technical problem to be solved urgently in the assembly production of automobile structural parts and other parts.
The invention discloses a bending tester for a circular weld of a large-deformation pipeline and a method thereof, and discloses the bending tester for the circular weld of the large-deformation pipeline and the method thereof. Compared with the prior art, the invention can realize the collection and analysis of mechanical signals and deformation signals in the bending test and can also aim at acoustic signals.
The invention discloses a method and a device for testing impact toughness of a pipe plate welding joint plug, and discloses the method and the device for testing the impact toughness of the pipe plate welding joint plug. The typical device comprises a portal working platform, two drop hammer guide rods, a lifting chain and a hinge wheel, wherein the two drop hammer guide rods are vertical to the portal working platform, and the lifting chain and the hinge wheel are respectively fixed on the top surface and the side surface of the portal working platform to lift and release drop hammers; a measuring scale fixed on the side surface of the door-shaped working platform, a speed sensor for testing the drop hammer speed after impact and a spring sleeved on the guide rod; and the sample fixing tool and the test sample are positioned in the center of the door-shaped working platform and are opposite to the lower end face of the drop hammer. The method solves the problem that the impact toughness of the plug of the pipe plate welding joint is difficult to evaluate.
CN201285362Y steel weld bending fatigue test device, this patent discloses a belted steel weld bending fatigue test device, utilizes the reciprocating motion of cam, draw-in groove and compression roller, can in time, accurate measurement belted steel weld bending resistance ability.
In summary, most of the existing patents on the aspect of weld bending performance focus on the performance detection direction, and no solution is provided for the problem of weld cracking in forming processing.
Disclosure of Invention
Aiming at the problems, the invention provides a method for improving the bending performance of a welded joint of a pickled plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the bending performance of a welded joint of a pickled plate comprises the following steps:
selecting a pickling plate;
selecting a welding wire, wherein the welding wire comprises the following chemical components in percentage by mass: 0.6% -0.8% and V:0.3 to 0.6 percent;
the diameter of the welding wire is 0.8-1.2 mm;
and welding the pickled plate by adopting gas shielded welding or laser welding.
Preferably, the pickled plate is made of QStE550 and has a thickness of 3.0mm.
Preferably, the chemical components of the pickled plate comprise C: 0.035-0.07%, mn:1.6% -2.0%, si: 0.04-0.12%, P: less than or equal to 0.025% and S: less than or equal to 0.018 percent.
Preferably, the chemical composition of the welding wire further includes, by mass, C:0.09% -0.12%, mn:1.5% -2.2%, si:0.5% -0.6%, P: less than or equal to 0.02 percent, S: less than or equal to 0.01 percent and Cr:0.06 percent to 0.12 percent.
Preferably, the shielding gas of the gas shielded welding is a mixed gas of CO2 and Ar, wherein the volume ratio of CO2 is 60-80%, and the volume ratio of Ar is 20-40%.
Preferably, the welding process range of the gas shielded welding is as follows:
welding current: 93-136A;
welding voltage: 17-24V;
welding speed: 10-25cm/min;
the protective gas is 80% of CO2 and 20% of Ar by volume, and the gas flow is 12-18L/min.
Preferably, the welding process of the laser welding comprises the steps of laser power of 6.3-7.2Kw, welding speed of 1.0-2.3m/min, wire feeding speed of 4.5-6.3m/min, protective gas which is nitrogen with the volume ratio of 99.9%, protective gas flow of 900-1000L/H, defocusing amount of 0.5-0.9 mm,
preferably, the gas shielded welding is adopted for welding the pickled plates, and comprises the following steps:
cutting out a welding and pickling plate, wherein the pickling plate does not need to be provided with a groove;
polishing the to-be-welded surface of the pickling plate to ensure that the burr length of the to-be-welded surface is less than or equal to 0.05mm, the straightness is less than or equal to 0.10mm and the straightness is less than or equal to 0.15mm;
placing the acid pickling plate on a workbench, wherein the welding gap is 1.5mm, the angle between a welding gun and the acid pickling plate is 60-75 degrees, and the extension length of a welding wire is 15-18mm;
and welding the pickled plate.
Preferably, the laser welding is adopted to weld the pickled plates, and the method comprises the following steps:
cutting out a welding and pickling plate, wherein the pickling plate does not need to be provided with a groove;
polishing the surface to be welded of the pickling plate to ensure that the burr length of the surface to be welded is less than or equal to 0.05mm, the straightness is less than or equal to 0.10mm, and the straightness is less than or equal to 0.15mm;
placing the acid-washing plate on a workbench, and placing a single-beam laser welding working head above a test plate to be welded without leaving a gap between the test plates;
protecting the welding seam by using nitrogen, wherein the distance between a gas blowing port and the welding seam is 15-20mm;
and welding the pickled plate.
Preferably, the method for improving the bending performance of the welded joint of the pickled plate further comprises the following checking steps:
carrying out a bending experiment on the welded pickled plate;
and after the bending experiment, observing the cracking condition of the welding seam of the pickled plate.
The invention has the beneficial effects that:
according to the invention, a certain amount of Ni and V elements are added into the welding wire, and the pickled plate is welded by gas shielded welding or laser welding, so that the grain size of the welding seam is refined, the ductility and toughness are effectively improved, the bending performance of the welding joint is further improved, and the problem of welding seam cracking is effectively solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a weld zone microstructure of a gas shielded weld of the present invention;
FIG. 2 shows a microstructure of a heat affected zone of a gas shielded weld of the present invention;
FIG. 3 shows a weld zone microstructure of a laser weld of the present invention;
FIG. 4 shows a microstructure of the heat affected zone of a laser weld of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
A method for improving the bending performance of a welded joint of a pickled plate comprises the following steps:
selecting a pickling plate;
selecting a welding wire, wherein the chemical components of the welding wire comprise Ni:0.6% -0.8% and V:0.3 to 0.6 percent;
the diameter of the welding wire is 0.8-1.2 mm;
welding the pickled plate by adopting gas shielded welding or laser welding;
carrying out a bending experiment on the welded pickled plate;
and after the bending experiment, observing the cracking condition of the welding seam of the pickled plate.
It should be noted that, a certain amount of Ni and V elements are added into the welding wire, which is beneficial to refining the grain size of the welded joint, effectively improving the ductility and toughness, and further improving the bending performance of the welded joint.
Further, the pickled plate is made of QStE550, the thickness of the pickled plate is 3.0mm, and the pickled plate comprises the following chemical components in percentage by mass: 0.035-0.07%, mn:1.6% -2.0%, si: 0.04-0.12%, P: less than or equal to 0.025% and S: less than or equal to 0.018 percent.
Further, as shown in table 1, the chemical composition of the welding wire further includes C:0.09% -0.12%, mn:1.5% -2.2%, si:0.5% -0.6%, P: less than or equal to 0.02 percent, S: less than or equal to 0.01 percent and Cr:0.06 percent to 0.12 percent.
TABLE 1 welding wire chemistry
Further, the shielding gas of the gas shielded welding is CO 2 And Ar mixed gas of CO 2 The volume ratio of (A) is 60-80%, and the volume ratio of Ar is 20-40%.
Further, the welding process range of the gas shielded welding is as follows:
welding current: 93-136A;
welding voltage: 17-24V;
welding speed: 10-25cm/min;
the protective gas is 80% CO by volume 2 And 20% by volume of Ar, wherein the gas flow is 12-18L/min.
Furthermore, the welding process of the laser welding is that the laser power is 6.3-7.2KW, the welding speed is 1.0-2.3m/min, the wire feeding speed is 4.5-6.3m/min, the shielding gas is nitrogen with the volume ratio of 99.9 percent, the flow rate of the shielding gas is 900-1000L/H, the defocusing amount is 0.5-0.9 mm,
further, welding the pickled plate by adopting gas shielded welding comprises the following steps:
cutting out a welding and pickling plate, wherein the pickling plate does not need to be provided with a groove;
polishing the surface to be welded of the pickling plate to ensure that the burr length of the surface to be welded is less than or equal to 0.05mm, the straightness is less than or equal to 0.10mm, and the straightness is less than or equal to 0.15mm;
placing the acid pickling plate on a workbench, wherein the welding gap is 1.5mm, the angle between a welding gun and the acid pickling plate is 60-75 degrees, and the extension length of a welding wire is 15-18mm;
and welding the pickled plate.
Note that, in the gas shielded welding, the diameter of the welding wire is preferably 0.8cm.
It should be noted that the microstructure of the weld zone after the optimized welding wire composition by gas shielded welding is shown in fig. 1, and the microstructure of the heat affected zone is shown in fig. 2.
Further, the pickled plates are welded by laser welding, and the method comprises the following steps:
cutting out a welding and pickling plate, wherein the pickling plate does not need to be provided with a groove;
polishing the to-be-welded surface of the pickling plate to ensure that the burr length of the to-be-welded surface is less than or equal to 0.05mm, the straightness is less than or equal to 0.10mm and the straightness is less than or equal to 0.15mm;
placing the acid-washing plate on a workbench, and placing a single-beam laser welding working head above the test plate to be welded without a gap between the test plates;
protecting the welding seam by adopting nitrogen, wherein the distance between a gas blowing opening and the welding seam is 15-20mm;
and welding the pickled plate.
Note that, in laser welding, the diameter of the welding wire is preferably 1.2cm.
It should be noted that the microstructure of the weld zone after laser welding to optimize the composition of the welding wire is shown in fig. 3, and the microstructure of the heat affected zone is shown in fig. 4.
The properties of the pickled plates are compared with the specific examples below:
example 1: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 3, a bending test is carried out according to GB/T2653-2008 welding joint bending test method, and after a 180-degree bending test (surface bending and back bending), the test sample is not cracked and has excellent bending performance.
Example 2: the pickled plates are welded by adopting the welding wire components shown in the table 2 and the welding process shown in the table 3, a bending test is carried out according to GB/T2653-2008 welding joint bending test method, and after a 180-degree bending test (surface bending and back bending), the test sample is not cracked and has excellent bending performance.
Example 3: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 3, a bending test is carried out according to GB/T2653-2008 welding joint bending test method, and after a 180-degree bending test (surface bending and back bending), the test sample is not cracked and has excellent bending performance.
Comparative example 1: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 3, a bending test is carried out according to GB/T2653-2008 'welding joint bending test method', and after a 180-degree bending test (surface bending and back bending), a sample is cracked in a heat affected zone and has poor bending performance.
Comparative example 2: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 3, a bending test is carried out according to GB/T2653-2008 'welding joint bending test method', and after a 180-degree bending test (surface bending and back bending), a sample is cracked in a heat affected zone and has poor bending performance.
Comparative example 3: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 3, a bending test is carried out according to GB/T2653-2008 'welding joint bending test method', and after a 180-degree bending test (surface bending and back bending), a sample cracks at a welding seam and has poor bending performance.
Example 4: the pickled plates are welded by adopting the welding wire components shown in the table 2 and the welding process shown in the table 4, a bending test is carried out according to GB/T2653-2008 welding joint bending test method, and after a 180-degree bending test (surface bending and back bending), the test sample is not cracked and has excellent bending performance.
Example 5: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 4, a bending test is carried out according to GB/T2653-2008 welding joint bending test method, and after a 180-degree bending test (surface bending and back bending), the test sample is not cracked and has excellent bending performance.
Example 6: the pickled plates are welded by adopting the welding wire components shown in the table 2 and the welding process shown in the table 4, a bending test is carried out according to GB/T2653-2008 welding joint bending test method, and after a 180-degree bending test (surface bending and back bending), the test sample is not cracked and has excellent bending performance.
Comparative example 4: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 4, a bending test is carried out according to GB/T2653-2008 'welding joint bending test method', and after a 180-degree bending test (surface bending and back bending), a sample cracks at a welding seam and has poor bending performance.
Comparative example 5: the pickled plate is welded by adopting the welding wire components shown in Table 2 and the welding process shown in Table 4, a bending test is carried out according to GB/T2653-2008 'welding joint bending test method', and after a 180-degree bending test (surface bending and back bending), a sample cracks at a welding seam and has poor bending performance.
Comparative example 6: welding the pickled plate by adopting welding wire components shown in Table 2 and a welding process shown in Table 4, performing a bending test according to GB/T2653-2008 welding joint bending test method, and cracking the sample in a heat affected zone and having poor bending performance after 180-degree bending test (surface bending and back bending).
TABLE 2 welding wire chemistry
TABLE 3 welding process by carbon dioxide arc welding
TABLE 4 laser welding process
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for improving the bending performance of a welded joint of a pickled plate comprises the following steps:
selecting a pickling plate;
selecting a welding wire, wherein the welding wire comprises the following chemical components in percentage by mass: 0.6% -0.8% and V:0.3 to 0.6 percent;
the diameter of the welding wire is 0.8-1.2 mm;
and welding the pickled plate by adopting gas shielded welding or laser welding.
2. The method of claim 1, wherein the pickled plate is QStE550 and has a thickness of 3.0mm.
3. The method for improving the bending performance of the welded joint of the pickled plate as claimed in claim 2, wherein the chemical composition of the pickled plate comprises C:0.035 to 0.07%, mn:1.6% -2.0%, si: 0.04-0.12%, P: less than or equal to 0.025% and S: less than or equal to 0.018 percent.
4. The method of improving the bending performance of a welded joint of pickled plates as defined in claim 1, wherein the chemical composition of said welding wire further comprises C:0.09% -0.12%, mn:1.5% -2.2%, si:0.5% -0.6%, P: less than or equal to 0.02 percent, S: less than or equal to 0.01 percent and Cr:0.06 percent to 0.12 percent.
5. The method of claim 1, wherein the shielding gas of the gas shielded welding is CO 2 And Ar mixed gas of CO 2 The volume ratio of (A) is 60-80%, and the volume ratio of Ar is 20-40%.
6. The method for improving the bending property of the welded joint of the pickled plate as claimed in claim 5, wherein the welding process range of the gas shielded welding is as follows:
welding current: 93-136A;
welding voltage: 17-24V;
welding speed: 10-25cm/min;
the protective gas is 80% CO by volume 2 And 20% by volume of Ar, wherein the gas flow is 12-18L/min.
7. The method for improving the bending property of the welded joint of the pickled plate as claimed in claim 1, wherein the welding process of the laser welding is 6.3-7.2Kw of laser power, 1.0-2.3m/min of welding speed, 4.5-6.3m/min of wire feeding speed, 99.9% volume ratio of nitrogen as shielding gas, 900-1000L/H of shielding gas flow and 0.5-0.9 mm of defocusing amount.
8. The method of improving the bending performance of the welded joint of the pickled plate as claimed in claim 1, wherein the pickled plate is welded by the gas shielded welding, comprising the following steps:
cutting out the welding and pickling plate, wherein the pickling plate does not need to be provided with a groove;
polishing the to-be-welded surface of the pickling plate to ensure that the burr length of the to-be-welded surface is less than or equal to 0.05mm, the straightness is less than or equal to 0.10mm and the straightness is less than or equal to 0.15mm;
placing the acid pickling plate on a workbench, wherein the welding gap is 1.5mm, the angle between a welding gun and the acid pickling plate is 60-75 degrees, and the extension length of a welding wire is 15-18mm;
and welding the pickled plate.
9. The method of claim 1, wherein the laser welding is used for welding the pickled plate, and the method for improving the bending property of the welded joint of the pickled plate comprises the following steps:
cutting out the welding and pickling plate, wherein the pickling plate does not need to be provided with a groove;
polishing the to-be-welded surface of the pickling plate to ensure that the burr length of the to-be-welded surface is less than or equal to 0.05mm, the straightness is less than or equal to 0.10mm and the straightness is less than or equal to 0.15mm;
placing the acid-washing plate on a workbench, and placing a single-beam laser welding working head above a test plate to be welded without leaving a gap between the test plates;
protecting the welding seam by using nitrogen, wherein the distance between a gas blowing port and the welding seam is 15-20mm;
and welding the pickled plate.
10. The method of improving the bending performance of a welded joint of pickled plates as claimed in any one of claims 1 to 9, further comprising the step of inspecting:
carrying out a bending experiment on the welded pickled plate;
and after the bending experiment, observing the cracking condition of the welding seam of the pickled plate.
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